vindicator submits, Ultramagnetic is the name of a new open-source secure instant messaging client based on the popular Gaim software and GnuPG's libgcrypt library. It supports strong end-to-end encryption with 256-bit AES and anonymous routing with Hacktivismo's Six/Four protocol.. . .
vindicator submits, Ultramagnetic is the name of a new open-source secure instant messaging client based on the popular Gaim software and GnuPG's libgcrypt library. It supports strong end-to-end encryption with 256-bit AES and anonymous routing with Hacktivismo's Six/Four protocol.

According to these screen shots, Win32 will be supported soon. Linux RPMs are already available.

From the Website, "Ultramagnetic is a concurrent fork of Gaim that adds strong end-to-end encryption using GnuPG's libgcrypt and anonymous routing using Hacktivismo's Six/Four protocol. It is licensed under the GNU Public License v2.0."